*{
    margin: 0px;
    padding: 0px;
}
/* 中间弹性布局 */
.grid{
    display: flex;
    flex-wrap:nowrap;
    justify-content: space-around;
}

.grid-cell-1{
    flex-grow: 1;
}
.grid-cell-2{
    flex-grow: 2;
}
.grid-cell-3{
    flex-grow: 3;
}
.grid-cell-4{
    flex-grow: 4;
}
.grid-cell-5{
    flex-grow: 5;
}
.grid-cell-6{
    flex-grow: 6;
}
